地铁区间大断面隧道施工力学行为研究

广州市轨道交通六号线越秀南～东湖区间是左、右行车和停车、折返的多功能区间,在停车、折返线区段形成了四线大跨度断面,该区段施工分部多、工序复杂,浅埋暗挖施工安全与其地面上方的五层住宅楼使用安全问题十分突出.为分析既有地面建筑与隧道施工的相互影响,采用地层模式对上述断面进行了施工动态模拟.分析结果表明,大跨隧道施工过程中,地层稳定、支护结构安全,但地面建筑附加作用对地表沉降、隧道结构受力均有不利影响,施工中应予以足够重视,并加强地面和洞内的监测.

Research on Construction Mechanical Behavior of Large Cross-section Tunnel in Subway Engineering

Yuexiu-Donghu tunnel section in 6th line of the subway in Guangzhou is a multi-function section for the needs of the train to run up line or down line,park and reverse.In parking and reversing location,the section comprises a four-driveway large cross-section tunnel.Because of the complexity of the construction process,the measure to insure safety of the tunnel and the existing building is important.In order to reduce the ground surface settlement and the risk of construction,the mechanical behavior of the tunnel is studied by 2D FEM numerical simulation method.The results show that the planning construction technology is feasible,but the unfavorable effect on distribution of ground surface settlement and structure stress caused by the existing building is apparent.So it is necessary to reinforce the measure of monitoring during the construction.